Problem Solving Practice Test 4

In an essay competition the odds against competitors A, B, C and D are 2:1, 3:1, 4:1 and 5:1 respectively. Find the probability that one of them wins the competition.

11/120

114/120

127/150

2/17

135/157

Correct Answer : C

Question 2

A box contains 6 red, 4 white and 5 black balls. A person draws 4 balls at random. Find the probability that among the four balls, there is at least one of each colour.

31/91

15/91

48/91

24/91

12/91

Correct Answer : C

Question 3

In a town of 3000 people 600 are over 50 years, and 1000 are female. It is known that 30% of the females are over 50 years. What is the probability that a person chosen at random is either a female or over 50 years?

11:13

13:17

2:3

9:17

13:9

Correct Answer : B

Question 4

The probability that Amit will qualify in an exam is 0.05. The probability that Amita will qualify is 0.10. The probability that both will qualify is 0.02. Find the percent chances of both failing to qualify.

50%

25.5%

37%

53%

87%

Correct Answer : E

Question 5

Find the probability that a leap year will contain 53 Tuesdays.

3/14

2/7

1/12

1/4

1/7

Correct Answer : B

Question 6

Find the probability that a leap will contain either 53 Tuesdays or 53 Wednesdays

1/5

2/5

2/3

3/7

1/2

Correct Answer : D

Question 7

Find the probability that a leap will contain 53 Tuesdays and 53 Wednesdays.

3/7

1/7

1/3

2/7

1/5

Correct Answer : B

Question 8

Four cards are drawn from a pack of cards. Find the probability of drawing one card from each suit.

4/20825

2197/20825

17160/20825

17160/6497400

2197/6497400

Correct Answer : B

Question 9

Four persons are chosen at random from a group of 5 men, 3 women and 4 children. Find the probability of selecting 2 men, 2 woman and 2 children.

1/5

2/5

4/11

5/13

1/25

Correct Answer : C

Question 10

Find the odds in favour that when a number is chosen randomly from 1 to 200 then it is an even number and not a multiple of 15.

12 : 7

1:10

5:11

43:57

47:53

Correct Answer : E

Question 11

The odds that Amit speaks the truth are 1:2 and the odds that Bunty speaks the truth are 2:3. What is the probability that exactly one of Amit and Bunty is telling the truth?

3/5

4/15

7/15

4/7

3/7

Correct Answer : C

Question 12

Meena has to eat only one fruit out of three. The probability that she eats a banana is 3/2 times the probability that she eats an apple. The probability that she eats a guava is half the probability that she eats a banana. What is her probability of having an apple?

1/4

4/13

1/6

4/7

11/36

Correct Answer : B

Question 13

Four members are to be chosen from a group of 3 women and 4 children. Find the probability of selecting exactly 3 children.

3/50

12/25

1/5

12/35

1/7

Correct Answer : D

Question 14

The probability of picking an apple from a basket is 0.25 and that of picking a rotten fruit is 0.50. The probability of picking a rotten apple is 0.14. Find the probability that neither an apple is picked nor a rotten fruit is picked.

0.75

0.39

0.25

0.50

0.61

Correct Answer : B

Question 15

There are five shirts of different colours and five pants of the same five colours. The shirts have to be matched with the pants of same colours. Find the probability that all the five shirts and pants are matched correctly.